METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE. 



^^Iva:iiER,ST. 



Latitude, 42* 23' 48.5" N. Longitude 72* 31' xo" W. 



Height of barometer above ground, J///. Above sea level, 2'/j.^ ft. 

 Height of IViuiI Instruments 72 ft. 



BULLETIN No. 186. 



JUNE, 1904. 



MONTHLY SUMMARY. 



Preaaure. In inches. 

 Maximum reduced to freezing, 30.05,9th, 8 p- 

 Minimum reduced to freezing, 29.25, 22d, 5 A. 

 Reducedt ma.\imum reading, 30-35. 9th, 8 v. 

 Keducedt minimum reading, 29.54, 22d, 5 A. 



Mean semi-daily reduced, 30.021 



Montlily range, o-Si 



*Air Temperature. In Degrees Fahr. 



Highest, 92.5. 26th, 3 P. 



Lowest 41-0. loth, 5 A. 



Mean iiourly, 65.0 



Mean of means of max. and min., .... 65.3 



Mean sensible (wet bulb), 59-6 



Monthly range, 5''5 



Highest mean daily, 79.5,26th 



Lowest mean daily 54-8, loth 



Mean maximum, 77-4 



Mean minimum, 53-3 



Mean daily range 24 



Greatest daily range, 37-5. 'ith 



Least daily range, 8.5,29tii 



Humidity. 



Mean dew point, 56.6 



Mean force of vapor, 616 



Mean relative humidity, 77-o 



Precipitation. In inches. 



Total precipitation, 5-35 



Number of days on which .01 inch or more 



rain or melted snow fell, >i 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 3127 m. 



Greatest daily movement, . . . .223 m., 15th 



Least daily movement i2ni., 3d 



Mean daily movement, :04m. 



Mean hourly velocity, 4-311 • 



Maximum pressure per square foot, 6.0 lbs. = 



35 m. per hour, 25th, 6 p., S. W. 

 Prevailing Direction, South. 



Summary. 



South, 20 per cent. 



Southwest, 10 " " 



-South, Southeast, '3 " " 



Other directions, 57 " " 



WeatJier. 



Mean cloudiness observed, .... 59 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 201 hrs.=44 per cent. 



Number of clear days, 14 



Number of fair days, 7 



Number of cloudy days, 9 



Bright Sunahine. 



Number of hours recorded, . . . 256hrs. = 56^ 

 Itain, 2d, 3d, 4th. 5th, 6th. 7th, 8th, gth, 16th, 



2ISt, 22d, 25th, 28th, 29th, 30th. 



Oales, 35 miles or more per hour, 35 m. 25th, 

 S.W. 



Thunder and TJghtnlng, 5th, 7th, 8th, '25th, 

 30th. 



